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LTC3526LB-2 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 LTC3526LB-2
部品説明 550mA 2MHz Synchronous Step-Up DC/DC Converters
メーカ Linear
ロゴ Linear ロゴ 

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LTC3526LB-2 Datasheet, LTC3526LB-2 PDF,ピン配置, 機能
Features
n Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
n VIN Start-Up Voltage: 680mV
n 1.5V to 5.25V VOUT Range
n Up to 94% Efficiency
n Output Disconnect
n 2MHz Fixed Frequency Operation
n VIN > VOUT Operation
n Integrated Soft-Start
n Current Mode Control with Internal Compensation
n Burst Mode® Operation with 9µA IQ (LTC3526L-2)
n Low Noise PWM Operation (LTC3526LB-2)
n Internal Synchronous Rectifier
n Logic Controlled Shutdown (IQ < 1µA)
n Anti-Ring Control
n Low Profile (2mm × 2mm × 0.75mm) 6-Lead
DFN Package
Applications
n Medical Instruments
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
LTC3526L-2/LTC3526LB-2
550mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
Description
The LTC®3526L-2/LTC3526LB-2 are synchronous, fixed
frequency step-up DC/DC converters with output discon-
nect. Synchronous rectification enables high efficiency in
the low profile 2mm × 2mm DFN package. Battery life in
single AA/AAA powered products is extended further with
a 680mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 2MHz minimizes solution foot-
print by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM design
is internally compensated, reducing external parts count.
The LTC3526L-2 features Burst Mode operation at light
load conditions allowing it to maintain high efficiency over
a wide range of load. The LTC3526LB-2 features fixed
frequency operation for low noise applications. Anti-ring
circuitry reduces EMI by damping the inductor in discon-
tinuous mode. Additional features include a low shutdown
current of under 1µA and thermal shutdown.
The LTC3526L-2/LTC3526LB-2 are housed in a 2mm ×
2mm × 0.75mm DFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patents pending.
Typical Application
2.2µH
VIN
1.6V TO 3.2V
4.7µF
OFF ON
SW
VIN VOUT
LTC3526L-2
SHDN FB
GND
1.78M
1M
33pF
VOUT
3.3V
200mA
4.7µF
3526lb2 TA01a
Efficiency and Power Loss vs Load Current
100
90
VIN = 2.4V
1000
80 EFFICIENCY 100
70
60 10
50
40
POWER LOSS
1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526lb2 TA01b
3526lb2fa


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